ZyXEL Communications 56K manual Fax Function, Voice Function, ITU-T T.30 Fax Protocol

User's Guide for ZyXEL Omni 56K USB Modem

3.3.3 Fax Function

Fax Physical Layer Protocol

Table 8. Fax Physical Layer Capacity

STANDARD	BIT RATE	BAUD RATE	MODULATION	CARRIER FREQUENCY
	[bps]	[baud]		[Hz]
V.17	14400-7200	2400	TCM	1800
V.29	9600-4800	2400	QAM/DPSK	1700
V.27ter	4800-2400	1600/1200	PSK/DPSK	1800

EIA (Electronic Industries Association) Class 1/Class 2/Class 2.0 Command Set

Please refer to Fax Command Set in Chapter 5.

ITU-T T.30 Fax Protocol

The ITU-T T.30 fax protocol is known as the G3 fax handshake signals and procedures. The modem takes full control of this protocol – initiating and terminating fax calls, managing the communication session, and transporting the image data. Therefore, the modem relieves the computer fax software of the T.30 protocol handling.

Your modem allows for fax speeds up to 14400 bps when transmitting to a fax machine which complies with the V.17 fax standard. Speeds fall back to 12000, 9600, or 7200 bps in poor line conditions. When connecting to a G3 fax device, your modem allows for fax speeds up to 9600 bps and automatically falls back to 7200, 4800, and 2400 bps if the line quality is poor.

3.3.4 Voice Function

Voice capability stands for the modem’s ability to digitize incoming voice messages, which the computer stores and forwards. It also means that the modem playback the recorded digitized voice on line for a message announcement.

Voice IS-101 Command Set

Please refer to the Voice command sets in Chapter 5.

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